Questions and postings pertaining to the development of ImageMagick, feature enhancements, and ImageMagick internals. ImageMagick source code and algorithms are discussed here. Usage questions which are too arcane for the normal user list should also be posted here.

During this command run
— there are created temp files size of 59,2MiB i believe it's just copy of all my source files
— created one more temp file with total size 59,2MiB * 95 ≈ 5,6GiB
— temp files deleted one by one
— target all_map.png created

There is a more optimal way to handle montages-- apply one image at a time and dispose of it before the next is applied. We choose instead to collect all images first because that is what ImageMagick other utilities were designed to do. We suspect handling one image at a time would benefit your use case. However, its unlikely that this optimization will ever be effected because it would likely take months to complete and there are still thousands of pending "things to do" to improve ImageMagick.